if_loop.c revision 1.51
1 /* $NetBSD: if_loop.c,v 1.51 2004/08/19 20:58:24 christos Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)if_loop.c 8.2 (Berkeley) 1/9/95 61 */ 62 63 /* 64 * Loopback interface driver for protocol testing and timing. 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: if_loop.c,v 1.51 2004/08/19 20:58:24 christos Exp $"); 69 70 #include "opt_inet.h" 71 #include "opt_atalk.h" 72 #include "opt_iso.h" 73 #include "opt_ns.h" 74 #include "opt_ipx.h" 75 #include "opt_mbuftrace.h" 76 77 #include "bpfilter.h" 78 #include "loop.h" 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/kernel.h> 83 #include <sys/mbuf.h> 84 #include <sys/socket.h> 85 #include <sys/errno.h> 86 #include <sys/ioctl.h> 87 #include <sys/time.h> 88 89 #include <machine/cpu.h> 90 91 #include <net/if.h> 92 #include <net/if_types.h> 93 #include <net/netisr.h> 94 #include <net/route.h> 95 96 #ifdef INET 97 #include <netinet/in.h> 98 #include <netinet/in_systm.h> 99 #include <netinet/in_var.h> 100 #include <netinet/ip.h> 101 #endif 102 103 #ifdef INET6 104 #ifndef INET 105 #include <netinet/in.h> 106 #endif 107 #include <netinet6/in6_var.h> 108 #include <netinet/ip6.h> 109 #endif 110 111 #ifdef NS 112 #include <netns/ns.h> 113 #include <netns/ns_if.h> 114 #endif 115 116 #ifdef IPX 117 #include <netipx/ipx.h> 118 #include <netipx/ipx_if.h> 119 #endif 120 121 #ifdef ISO 122 #include <netiso/iso.h> 123 #include <netiso/iso_var.h> 124 #endif 125 126 #ifdef NETATALK 127 #include <netatalk/at.h> 128 #include <netatalk/at_var.h> 129 #endif 130 131 #if NBPFILTER > 0 132 #include <net/bpf.h> 133 #endif 134 135 #if defined(LARGE_LOMTU) 136 #define LOMTU (131072 + MHLEN + MLEN) 137 #define LOMTU_MAX LOMTU 138 #else 139 #define LOMTU (32768 + MHLEN + MLEN) 140 #define LOMTU_MAX (65536 + MHLEN + MLEN) 141 #endif 142 143 struct ifnet loif[NLOOP]; 144 #ifdef MBUFTRACE 145 struct mowner lomowner[NLOOP]; 146 #endif 147 148 #ifdef ALTQ 149 void lostart(struct ifnet *); 150 #endif 151 152 void 153 loopattach(n) 154 int n; 155 { 156 int i; 157 struct ifnet *ifp; 158 159 for (i = 0; i < NLOOP; i++) { 160 ifp = &loif[i]; 161 snprintf(ifp->if_xname, sizeof(ifp->if_xname), "lo%d", i); 162 ifp->if_softc = NULL; 163 ifp->if_mtu = LOMTU; 164 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST; 165 ifp->if_ioctl = loioctl; 166 ifp->if_output = looutput; 167 #ifdef ALTQ 168 ifp->if_start = lostart; 169 #endif 170 ifp->if_type = IFT_LOOP; 171 ifp->if_hdrlen = 0; 172 ifp->if_addrlen = 0; 173 ifp->if_dlt = DLT_NULL; 174 IFQ_SET_READY(&ifp->if_snd); 175 if_attach(ifp); 176 if_alloc_sadl(ifp); 177 #if NBPFILTER > 0 178 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 179 #endif 180 #ifdef MBUFTRACE 181 ifp->if_mowner = &lomowner[i]; 182 strlcpy(ifp->if_mowner->mo_name, ifp->if_xname, 183 sizeof(ifp->if_mowner->mo_name)); 184 MOWNER_ATTACH(&lomowner[i]); 185 #endif 186 } 187 } 188 189 int 190 looutput(ifp, m, dst, rt) 191 struct ifnet *ifp; 192 struct mbuf *m; 193 struct sockaddr *dst; 194 struct rtentry *rt; 195 { 196 int s, isr; 197 struct ifqueue *ifq = 0; 198 199 MCLAIM(m, ifp->if_mowner); 200 if ((m->m_flags & M_PKTHDR) == 0) 201 panic("looutput: no header mbuf"); 202 #if NBPFILTER > 0 203 if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) 204 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m); 205 #endif 206 m->m_pkthdr.rcvif = ifp; 207 208 if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { 209 m_freem(m); 210 return (rt->rt_flags & RTF_BLACKHOLE ? 0 : 211 rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); 212 } 213 214 ifp->if_opackets++; 215 ifp->if_obytes += m->m_pkthdr.len; 216 217 #ifdef ALTQ 218 /* 219 * ALTQ on the loopback interface is just for debugging. It's 220 * used only for loopback interfaces, not for a simplex interface. 221 */ 222 if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) && 223 ifp->if_start == lostart) { 224 struct altq_pktattr pktattr; 225 int error; 226 227 /* 228 * If the queueing discipline needs packet classification, 229 * do it before prepending the link headers. 230 */ 231 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 232 233 M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT); 234 if (m == NULL) 235 return (ENOBUFS); 236 *(mtod(m, uint32_t *)) = dst->sa_family; 237 238 s = splnet(); 239 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 240 (*ifp->if_start)(ifp); 241 splx(s); 242 return (error); 243 } 244 #endif /* ALTQ */ 245 246 m_tag_delete_nonpersistent(m); 247 248 switch (dst->sa_family) { 249 250 #ifdef INET 251 case AF_INET: 252 ifq = &ipintrq; 253 isr = NETISR_IP; 254 break; 255 #endif 256 #ifdef INET6 257 case AF_INET6: 258 m->m_flags |= M_LOOP; 259 ifq = &ip6intrq; 260 isr = NETISR_IPV6; 261 break; 262 #endif 263 #ifdef NS 264 case AF_NS: 265 ifq = &nsintrq; 266 isr = NETISR_NS; 267 break; 268 #endif 269 #ifdef ISO 270 case AF_ISO: 271 ifq = &clnlintrq; 272 isr = NETISR_ISO; 273 break; 274 #endif 275 #ifdef IPX 276 case AF_IPX: 277 ifq = &ipxintrq; 278 isr = NETISR_IPX; 279 break; 280 #endif 281 #ifdef NETATALK 282 case AF_APPLETALK: 283 ifq = &atintrq2; 284 isr = NETISR_ATALK; 285 break; 286 #endif 287 default: 288 printf("%s: can't handle af%d\n", ifp->if_xname, 289 dst->sa_family); 290 m_freem(m); 291 return (EAFNOSUPPORT); 292 } 293 s = splnet(); 294 if (IF_QFULL(ifq)) { 295 IF_DROP(ifq); 296 m_freem(m); 297 splx(s); 298 return (ENOBUFS); 299 } 300 IF_ENQUEUE(ifq, m); 301 schednetisr(isr); 302 ifp->if_ipackets++; 303 ifp->if_ibytes += m->m_pkthdr.len; 304 splx(s); 305 return (0); 306 } 307 308 #ifdef ALTQ 309 void 310 lostart(struct ifnet *ifp) 311 { 312 struct ifqueue *ifq; 313 struct mbuf *m; 314 uint32_t af; 315 int s, isr; 316 317 for (;;) { 318 IFQ_DEQUEUE(&ifp->if_snd, m); 319 if (m == NULL) 320 return; 321 322 af = *(mtod(m, uint32_t *)); 323 m_adj(m, sizeof(uint32_t)); 324 325 switch (af) { 326 #ifdef INET 327 case AF_INET: 328 ifq = &ipintrq; 329 isr = NETISR_IP; 330 break; 331 #endif 332 #ifdef INET6 333 case AF_INET6: 334 m->m_flags |= M_LOOP; 335 ifq = &ip6intrq; 336 isr = NETISR_IPV6; 337 break; 338 #endif 339 #ifdef IPX 340 case AF_IPX: 341 ifq = &ipxintrq; 342 isr = NETISR_IPX; 343 break; 344 #endif 345 #ifdef NS 346 case AF_NS: 347 ifq = &nsintrq; 348 isr = NETISR_NS; 349 break; 350 #endif 351 #ifdef ISO 352 case AF_ISO: 353 ifq = &clnlintrq; 354 isr = NETISR_ISO; 355 break; 356 #endif 357 #ifdef NETATALK 358 case AF_APPLETALK: 359 ifq = &atintrq2; 360 isr = NETISR_ATALK; 361 break; 362 #endif 363 default: 364 printf("%s: can't handle af%d\n", ifp->if_xname, af); 365 m_freem(m); 366 return; 367 } 368 369 s = splnet(); 370 if (IF_QFULL(ifq)) { 371 IF_DROP(ifq); 372 splx(s); 373 m_freem(m); 374 return; 375 } 376 IF_ENQUEUE(ifq, m); 377 schednetisr(isr); 378 ifp->if_ipackets++; 379 ifp->if_ibytes += m->m_pkthdr.len; 380 splx(s); 381 } 382 } 383 #endif /* ALTQ */ 384 385 /* ARGSUSED */ 386 void 387 lortrequest(cmd, rt, info) 388 int cmd; 389 struct rtentry *rt; 390 struct rt_addrinfo *info; 391 { 392 393 struct ifnet *ifp = &loif[0]; 394 if (rt) 395 rt->rt_rmx.rmx_mtu = ifp->if_mtu; 396 397 } 398 399 /* 400 * Process an ioctl request. 401 */ 402 /* ARGSUSED */ 403 int 404 loioctl(ifp, cmd, data) 405 struct ifnet *ifp; 406 u_long cmd; 407 caddr_t data; 408 { 409 struct ifaddr *ifa; 410 struct ifreq *ifr; 411 int error = 0; 412 413 switch (cmd) { 414 415 case SIOCSIFADDR: 416 ifp->if_flags |= IFF_UP; 417 ifa = (struct ifaddr *)data; 418 if (ifa != 0 /*&& ifa->ifa_addr->sa_family == AF_ISO*/) 419 ifa->ifa_rtrequest = lortrequest; 420 /* 421 * Everything else is done at a higher level. 422 */ 423 break; 424 425 case SIOCSIFMTU: 426 ifr = (struct ifreq *)data; 427 if ((unsigned)ifr->ifr_mtu > LOMTU_MAX) 428 error = EINVAL; 429 else { 430 /* XXX update rt mtu for AF_ISO? */ 431 ifp->if_mtu = ifr->ifr_mtu; 432 } 433 break; 434 435 case SIOCADDMULTI: 436 case SIOCDELMULTI: 437 ifr = (struct ifreq *)data; 438 if (ifr == 0) { 439 error = EAFNOSUPPORT; /* XXX */ 440 break; 441 } 442 switch (ifr->ifr_addr.sa_family) { 443 444 #ifdef INET 445 case AF_INET: 446 break; 447 #endif 448 #ifdef INET6 449 case AF_INET6: 450 break; 451 #endif 452 453 default: 454 error = EAFNOSUPPORT; 455 break; 456 } 457 break; 458 459 default: 460 error = EINVAL; 461 } 462 return (error); 463 } 464
Indexes created Wed Sep 24 05:09:52 GMT 2025